Carton blank



FIG. 1 is a top perspective view of a carton blank in unfolded condition, showing our new design;

FIG. 2 is a perspective view thereof in partially folded condition, with a broken line showing of a book to be packaged for illustrative purposes and forming no part of the design;

FIG. 3 is a perspective view thereof of the carton blank shown in FIG. 1 in further folded condition showing a backing strip partially removed;

FIG. 4 is a perspective view thereof in further folded condition prior to sealing; and,

FIG. 5 is a rear perspective view thereof in fully folded condition. 

The ornamental design for a carton blank, as shown and described. 